/*
 * Created on 16 May 2006
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package plugins.extseed.impl;

import java.util.List;

import plugins.peers.PeerReadRequest;

import plugins.extseed.ExternalSeedException;
import plugins.extseed.util.ExternalSeedHTTPDownloaderListener;

public class 
ExternalSeedReaderRequest 
	implements ExternalSeedHTTPDownloaderListener
{
	private ExternalSeedReaderImpl	reader;
	
	private List<PeerReadRequest>			requests;

	private int		start_piece_number;
	private int		start_piece_offset;
	
	private int		length;
	
	private int					current_request_index = 0;
	private PeerReadRequest		current_request;
	private byte[]				current_buffer;
	private int					current_position;
	
	protected 
	ExternalSeedReaderRequest(
		ExternalSeedReaderImpl		_reader,
		List<PeerReadRequest>		_requests )
	{
		reader		= _reader;
		requests	= _requests;
		
		for (int i=0;i<requests.size();i++){
			
			PeerReadRequest	req = (PeerReadRequest)requests.get(i);
			
			if ( i == 0 ){
				
				start_piece_number	= req.getPieceNumber();
				start_piece_offset	= req.getOffset();
			}
			
			length	+= req.getLength();
		}
	}
	
	public int
	getStartPieceNumber()
	{
		return( start_piece_number );
	}
	
	public int
	getStartPieceOffset()
	{
		return( start_piece_offset );
	}
	
	public int
	getLength()
	{
		return( length );
	}
	
	public byte[]
	getBuffer()
	
		throws ExternalSeedException
	{
		if ( current_request_index >= requests.size()){
			
			throw( new ExternalSeedException( "Insufficient buffers to satisfy request" ));
		}
		
		current_request = (PeerReadRequest)requests.get(current_request_index++);
		
		current_buffer = new byte[ current_request.getLength()];
		
		current_position	= 0;
		
		return( current_buffer );
	}
	     
	public boolean 
	isCancelled() 
	{
		for (int i=0;i<requests.size();i++){
			
			PeerReadRequest	req = requests.get(i);

			if ( req.isCancelled()){
				
				return( true );
			}
		}
		
		return( false );
	}
	
	public void
	done()
	{
		reader.informComplete( current_request, current_buffer );
	}
	
	protected void
	cancel()
	{
		for (int i=0;i<requests.size();i++){
			
			PeerReadRequest	req = requests.get(i);

			if ( !req.isCancelled()){
				
				req.cancel();
			}
		}
	}
	
	public void
	failed()
	{
		for (int i=current_request_index;i<requests.size();i++){
			
			PeerReadRequest	request = requests.get(i);

			reader.informFailed( request );
		}
	}
	
	public void
	setBufferPosition(
		int	pos )
	{
		current_position	= pos;
	}
	
	public int
	getBufferPosition()
	{
		return( current_position );
	}
	
	public int
	getBufferLength()
	{
		return( current_buffer.length );
	}
	
	public int
	getPercentDoneOfCurrentIncomingRequest()
	{
		PeerReadRequest	req = current_request;
		
		if ( req == null ){
			
			return( 0 );
		}
		
		return(( 100 * current_position ) / req.getLength() );
		
	}
	
	public int
	getPermittedBytes()
	
		throws ExternalSeedException
	{
		PeerReadRequest	req = current_request;
		
		if ( req == null ){
			
			req = requests.get(0);	
		}
		
		if ( req.isCancelled()){
			
			throw( new ExternalSeedException( "Request cancelled" ));
		}
		
		return( reader.getPermittedBytes());
	}
	
	public int 
	getPermittedTime() 
	{
		return( 0 );	// no timeout
	}
	
	public void
	reportBytesRead(
		int		num )
	{
		reader.reportBytesRead( num );
	}
}
